#include <unistd.h>
#include <sys/wait.h>
#include <stdio.h>
#include "apue.h"

int main(void){

    char buf[MAXLINE];
    pid_t pid;
    int status;

    printf("%% ");
    while (fgets(buf, MAXLINE, stdin) != NULL)
    {
        if (buf[strlen(buf) - 1] == '\n'){
            buf[strlen(buf) - 1] = 0;
        }
        if ((pid = fork()) < 0){
            err_sys("fork error!");
        } else if (pid == 0){
            execlp(buf, buf, (char*)0);
            err_ret("counldn't execute: %s", buf);
            exit(127);
        }
        
        if ((pid = waitpid(pid, &status, 0)) < 0){
            err_sys("waitpid error");
        }
        printf("%%");
    }
    exit(0);
}